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Preparation method of high-performance lithium ion conduction membrane

An ion conducting membrane and conducting membrane technology, applied in the field of preparation of high-performance lithium ion conducting membrane, can solve the problems of loss and reduction of high-current charge and discharge capacity of batteries, and achieve high safety, high lithium ion conductivity, and excellent battery performance. Effects of chemical properties

Active Publication Date: 2014-09-03
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the characteristics of all-solid-state batteries, if the electrolyte is all Li 10 GeP 2 S 12 materials, the power characteristics of the battery, that is, the high-current charge and discharge capacity, will have a very large loss and decrease, which has greatly restricted practical applications.

Method used

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  • Preparation method of high-performance lithium ion conduction membrane

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Effect test

Embodiment 1

[0015] Such as figure 1 As shown, the commercialized Li with a particle size of 50 nm 10 GeP 2 S 12 Powder and PAN by mass ratio m Li10GeP2S12 :m PAN The ratio of =1:6 is dissolved in DMF organic solvent, and after fully stirring, a suspension with a solid content of 75% is formed. Put the suspension into the syringe of the electrospinning machine for electrospinning, the aperture of the spinning needle is 0.8mm, the spinning voltage is 10kV, the receiving distance is 19cm, the humidity is 30-40%, and the temperature is 30 o C, the base layer of the PP diaphragm is placed on the receiving plate of the metal foil; the static-spun diaphragm obtained above is hot-pressed by a roller-type hot press, and the hot-pressing temperature is 75 o C, A membrane with high ionic conductivity is obtained after hot pressing.

Embodiment 2

[0017] Commercialized Li with a particle size of 20 nm 10 GeP 2 S 12 Powder and PVDF by mass ratio m Li10GeP2S12 :m Pvdf =1:1 ratio is dissolved in NMP, and after fully stirring, a suspension with a solid content of 95% is formed. Put the suspension in the syringe of the electrospinning machine for electrospinning, the aperture of the spinning needle is 0.5mm, the spinning voltage is 20kV, the receiving distance is 15cm, the humidity is 25~35%, and the temperature is 20 o C, the base layer of the PE diaphragm is placed on the receiving plate of the metal foil; the above-mentioned still-spun diaphragm is hot-pressed by a roller-type hot press, and the hot-pressing temperature is 60 o C, A membrane with high ionic conductivity is obtained after hot pressing.

Embodiment 3

[0019] Commercialized Li with a particle size of 200 nm 10 GeP 2 S 12 Powder and PVDF-HFP by mass ratio m Li10GeP2S12 :m PVDF-HFP Dissolve in acetone at a ratio of 1:10, and form a suspension with a solid content of 30% after fully stirring. Put the suspension into the syringe of the electrospinning machine for electrospinning, the aperture of the spinning needle is 1.5mm, the spinning voltage is 20kV, the receiving distance is 25cm, the humidity is 30-45%, and the temperature is 40 o C, PET non-woven is arranged on the receiving plate of metal foil material; The still-spun diaphragm obtained above is hot-pressed by a drum-type hot-pressing machine, and the hot-pressing temperature is 85 o C, A membrane with high ionic conductivity is obtained after hot pressing.

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Abstract

The invention relates to a preparation method of a high-performance lithium ion conduction membrane. The preparation method is characterized by comprising the following steps: preparing a spinning solution; dissolving commercialized Li10GeP2S12 powder with the granularity of 20nm to 200nm and organic macromolecules with certain viscosity according to the mass ratio of mLi10GeP2S12 to m macromolecules of 1 to (1-10) in an organic solvent, and adequately stirring to form turbid liquid with solid content of 30 to 95 percent; and carrying out electrostatic spinning on the mixture, and thermally rolling an electrostatic spun diaphragm through a roller-type hot press at the temperature of 60 to 85 DEG C to obtain the diaphragm with high ion conductivity. The composite diaphragm is high in safety and high in lithium ion conductivity. A lithium ion battery utilizing the diaphragm is excellent in electrochemical performance.

Description

technical field [0001] The invention relates to a preparation method of a high-performance lithium ion conductive membrane, belonging to the technical field of lithium battery diaphragms. Background technique [0002] With the advancement of technology, lithium-ion batteries have attracted more and more attention, not only in the fields of battery products or smart phones, but also in the fields of energy storage batteries and automotive power batteries. Lithium-ion batteries have also made great strides in recent years. development of. Due to the requirements of these new and special fields, the size and capacity of battery cells are also getting larger and larger. Some manufacturers even design the capacity of battery cells as 200Ah, which puts forward higher requirements for the safety performance of batteries. Otherwise, once the battery catches fire or explodes, the consequences will be extremely serious. [0003] We know that an important factor that affects the safe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M50/403H01M50/44
CPCH01M50/403Y02E60/10
Inventor 姜涛陈慧明王丹张克金
Owner CHINA FIRST AUTOMOBILE
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